Convert AsyncTask to RxAndroid

Question

I have the following method to post response to UI using otto and AsyncTask.

private static void onGetLatestStoryCollectionSuccess(final StoryColle         


        

Answer 1

This is an example for a file download task using RxJava

Observable downloadFileObservable() {
    return Observable.create(new OnSubscribeFunc() {
        @Override
        public Subscription onSubscribe(Observer fileObserver) {
            try {
                byte[] fileContent = downloadFile();
                File file = writeToFile(fileContent);
                fileObserver.onNext(file);
                fileObserver.onCompleted();
            } catch (Exception e) {
                fileObserver.onError(e);
            }
            return Subscriptions.empty();
        }
    });
}

Usage:

downloadFileObservable()
  .subscribeOn(Schedulers.newThread())
  .observeOn(AndroidSchedulers.mainThread())
  .subscribe(observer); // you can post your event to Otto here

This would download the file on a new thread and notify you on the main thread.

OnSubscribeFunc was deprecated. Code updated to use OnSubscribe insted. For more info see issue 802 on Github.

Code from here.